JP2017098686A - Transmission equipment, network control device and transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission system which enables using a wavelength to be added and a wavelength in operation for a network with a predetermined signal characteristic, in consideration of an influence upon another wavelength.SOLUTION: At the additional installation of a channel to be operated in a network composed of a plurality of transmission equipment sets and a network management device, an influence on the operation channel for each of a plurality of intensity sets of the signals of the added channel and an influence on the added channel which receives from the operation channel are measured. Based on the measured result, the operating intensity of the signals of the added channel is set so that the signal on the operation channel and the signal on the added channel can be received in the transmission equipment on a reception destination with a predetermined characteristic.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmission device, a network control device, and a transmission system.

  2. Description of the Related Art An optical wavelength division multiplexing (WDM) transmission method for transmitting various types of information by combining a plurality of channels is applied to various transmission systems in a network.

  In addition, since the current network has a mesh-like and complicated configuration, there are often a plurality of paths for reaching from the transmission device at the transmission source to the transmission device at the reception destination. For this reason, there are many cases in which a plurality of detour paths at the time of failure and a plurality of paths at the time of expansion are considered.

  For this reason, there is a method of measuring signal characteristics using a test signal for a path to be expanded or switched when a channel is expanded or switched.

  For example, in a WDM transmission system in a network composed of a plurality of transmission devices, there is a method of measuring the signal characteristics of a test signal in a switching destination channel using a test signal when switching a channel in operation (for example, Patent Document 1).

JP 2001-244900 A

  In the future, as one of methods for increasing the capacity of the network, for example, a method of narrowing the interval between channels multiplexed by the WDM transmission method is conceivable.

  As the capacity of the network increases, the channel signal to be added and the channel signal whose path has been switched will affect the channel signal already in operation due to the nonlinear optical effect, etc. The characteristics are deteriorated.

  In the conventional WDM transmission system, as described above, the signal characteristics for the channel signal to be added and the channel signal for which the path has been switched are taken into consideration, but the channel signal in operation is the The deterioration of signal characteristics due to the influence from the signal is not taken into consideration.

  The signal characteristics deteriorate due to the influence of the channel signal to which the channel signal in operation is added or the signal of the channel whose path has been switched. A problem that cannot be done arises.

  Therefore, when a channel is added or switched, a method for adding a channel is required in consideration of the signal of the channel to be added and the signal of the channel being operated through the transmission path of the channel to be added.

  The present invention has been made in view of the above points, and provides a transmission device, a network control device, and a transmission system that allow an additional channel and an operating channel to be used in a network with predetermined signal characteristics. The purpose is to provide.

  In order to solve the above-described problem, in a network transmission system including a plurality of transmission apparatuses and a network control apparatus, a first transmission apparatus among the plurality of transmission apparatuses is a second transmission apparatus among the plurality of transmission apparatuses. The first transmission unit transmits a first channel signal at a first strength, and the second transmission apparatus transmits first information related to the signal quality of the terminated first channel signal at the first strength to the network control. The third transmission device of the plurality of transmission devices terminates the signal of the second channel passing through at least a part of the transmission path through which the signal of the first channel passes, and terminates the signal Second information related to the signal of the second channel is transmitted to the network control device, and the network control device is configured to transmit the first information based on the first information and the second information. Information of the second strength, which is the output strength of the signal of the channel, is transmitted to the first transmission device, and the first transmission device transmits the signal of the first channel at the second strength. A transmission system is provided.

  According to the above transmission system, it is possible to add a channel so that the signal of the channel being operated and the signal of the channel to be added have signal characteristics that exceed a predetermined level.

FIG. 1 is a diagram illustrating a configuration example of a network. FIG. 2 is a diagram illustrating a configuration example of the network control apparatus. FIG. 3 is a diagram illustrating a configuration example of the transmission apparatus. FIG. 4 is a flowchart illustrating an example of an operation when the transmission apparatus receives a control signal from the network control apparatus. FIG. 5 is a diagram illustrating an example of a relationship between an extension channel and an operation channel in the first embodiment. FIG. 6 is an example of the arrangement of extension channels and operation channels in the first embodiment. FIG. 7 is a diagram for explaining an example of a method for obtaining the strength limit value of the extension channel when the extension channel affects the operation channel. FIG. 8 is a diagram for explaining an example of the strength setting of the extension channel in the first embodiment. FIG. 9 is a diagram for explaining an example of a flowchart for determining the strength setting of the extension channel. FIG. 10 is a diagram illustrating an example of a relationship between an additional channel and an operation channel according to the second embodiment. FIG. 11 is an example of the arrangement of extension channels and operation channels in the second embodiment. FIG. 12 is a diagram for explaining an example of the strength setting of the extension channel in the second embodiment. FIG. 13 is a diagram illustrating an example of a relationship between an additional channel and an operation channel according to the third embodiment. FIG. 14 is an example of the arrangement of extension channels and operation channels in the third embodiment. FIG. 15 is a diagram for explaining an example of the strength setting of the extension channel in the third embodiment. FIG. 16 is a diagram illustrating an example of a relationship between an extension channel and an operation channel according to the fourth embodiment. FIG. 17 is an example of the arrangement of extension channels and operation channels in the fourth embodiment. FIG. 18 is a diagram for explaining an example of the strength setting of an additional channel in the fourth embodiment. FIG. 19 is a diagram for explaining an example of the strength setting of the extension channel in the fourth embodiment.

  Hereinafter, preferred embodiments of the disclosed technology will be described in detail with reference to the accompanying drawings.

(Embodiment 1)
First, the configuration of the network 10 will be described. An example of the configuration of the network 10 is shown in FIG. The network 10 includes a network control device 100 and transmission devices 200a, 200b, 200c, 200d, 200e, 200f, and 200g. Note that when the transmission devices 200a, 200b, 200c, 200d, 200e, 200f, and 200g are not distinguished, they are simply referred to as the transmission device 200. Further, the number of transmission apparatuses 200 is not limited to the number shown in FIG.

  The network control device 100 transmits information such as control information to each transmission device 200. In addition, each transmission apparatus 200 receives information such as signal characteristics of a signal received by the own transmission apparatus 200 from another transmission apparatus 200. The signal characteristics include BER (Bit Error Ratio), OSNR (Optical Signal Noise Ratio), and the like.

  The transmission apparatus 200 transmits the signal of the target channel based on the control information received from the network control apparatus 100. In addition, the transmission apparatus 200 transmits the measured value of the signal of each channel or the signal characteristic of the received signal to the network control apparatus 100.

  An example of a functional block diagram of the network control device 100 is shown in FIG. The network control apparatus 100 includes a communication unit 110, a control signal generation unit 120, a control unit 130, a signal allocation unit 140, a network information management unit 150, a determination unit 160, and a calculation unit 170.

  The communication unit 110 transmits the control signal generated by the control signal generation unit 120 to the destination transmission device 200.

  In addition, the communication unit 110 receives a measured value of a signal of each channel or a signal characteristic of a received signal from the transmission apparatus 200. Note that the communication unit 110 may be described separately for the transmission unit and the reception unit. A plurality of communication units 110 may be provided.

  The control signal generation unit 120 generates a control signal addressed to the target transmission apparatus 200 so as to generate probe light (test signal) for a newly allocated channel (additional channel) according to the control from the control unit 130. . Further, in accordance with control from the control unit 130, a control signal including information on an operation channel that is affected by the signal of the extension channel and information related to measurement for transmission to the transmission apparatus 200 that receives the signal of the extension channel is generated. .

  In addition, the control signal generation unit 120 does not put information on the signal of the measurement target channel (transmits a known signal) in order to perform measurement on the transmission apparatus 200 that is the transmission source of the signal of the affected operation channel. The control signal may be transmitted.

  An operation channel indicates a channel used for each transmission path in the network 10. In addition, a channel that is not used in the transmission path between the transmission apparatuses 200 in the network 10 is a non-operation channel. Further, the extension channel is a channel that is changed from a non-operation channel to an operation channel in a certain transmission line.

Further, the signal of the measurement target channel is a signal of a channel that is influenced by the signal of the extension channel among the signals of the operation channel. Note that the signal of the measurement target channel is described as the signal of the measurement target channel only when distinguishing from the signal of the other operation channel. A method for determining the signal of the measurement corresponding channel will be described later.

  The control signal generation unit 120 is configured by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

  The control unit 130 controls the signal allocation unit 140 to determine an additional channel. Further, when the information on the additional channel is sent from the signal allocation unit 140, the control unit 130 sends the control signal generation unit 120 to the control signal generation unit 120 based on the operation channel information of the network 10 stored in the network information management unit 150. On the other hand, control is performed so as to generate a control signal addressed to each transmission apparatus 200 that is a transmission source or reception destination of a channel related to measurement.

  In addition, based on the determination result of the determination unit 160, the control unit 130 determines that the amount of noise calculated by the calculation unit 170 in the network information management unit 150 when the signals of all measurement target channels fall within predetermined signal characteristics. The received signal characteristics and the like are stored, and the control signal generation unit 120 is controlled so that the signal strength of the additional channel is changed again and measured again. The noise amount will be described later.

  In addition, based on the determination result of the determination unit 160, the control unit 130 ends the measurement and calculation when the signal of any measurement target channel does not fall within the predetermined signal characteristics. The control unit 130 may store information such as the amount of noise and signal characteristics when the measurement is terminated.

  Further, the control unit 130 may determine the maximum intensity to be measured, and terminate the measurement and calculation regardless of the determination result of the determination unit 160 when the maximum intensity is reached.

  In addition, the control unit 130 notifies the calculation unit 170 to calculate the cumulative noise amount or the like according to the state of the network.

  The control unit 130 is realized by, for example, a CPU (Central Processing Unit) controlling each function.

  Under the control of the control unit 130, the signal allocating unit 140 determines an additional channel for changing from a non-operation channel to an operation channel in a certain transmission path based on information from the network information management unit 150.

  The signal allocation unit 140 can be realized, for example, by executing a predetermined program on the CPU.

  The network information management unit 150 has information such as operation channel information for each transmission path and a noise amount calculated by the calculation unit 170. Note that the operation channel information and the calculation result may be separately provided.

  The information of the network information management unit 150 is stored in a storage device such as a semiconductor memory element such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory (Flash Memory), or a hard disk or an optical disk. .

  The determination unit 160 determines whether the signal characteristic transmitted from the transmission apparatus 200 used for calculation by the calculation unit 170 is greater than a predetermined value, and determines the determination result, the amount of noise calculated by the calculation unit, the received signal characteristic, and the like. Notify the control unit 130.

  The calculation unit 170 calculates information related to the network 10 based on the signal characteristics transmitted from the transmission device 200 received by the communication unit 110. For example, the amount of noise is calculated from BER, OSNR, and the like. In addition, the increase / decrease in the noise amount accompanying the intensity change is calculated using a plurality of measurements. The calculation unit 170 notifies the determination unit 160 of the calculation result and the like.

  In addition, when receiving a notification such as calculation of the cumulative noise amount from the control unit 130, the calculation unit 170 calculates based on information related to the network management information unit 150.

  The noise amount is, for example, noise calculated from the reciprocal of OSNR of the operation channel signal. Further, when the signal strength of the extension channel is increased, it is possible to measure the increase in the noise amount accompanying the increase by taking the difference between the reciprocal of the OSNR after the increase and the reciprocal of the OSNR before the increase.

An example of a method of calculating the noise amount difference will be described. For example, the difference Δ noise amount P _Noise (P ₀ , P ₁ ) of the noise amount generated when the strength of the extension channel is increased from the strength P ₀ to the strength P ₁ is calculated using the operational channel strength P _sig ( _Equation 1 )
(Equation 1)
P _Noise (P ₀ , P ₁ ) / P _sig = OSNR (P ₁ ) ⁻¹ −OSNR (P ₀ ) ⁻¹

OSNR (P ₁ ) ⁻¹ and OSNR (P ₀ ) ⁻¹ are expressed by _Equation 2 using the noise amounts P _Noise (P ₁ ) and P _Noise (P ₀ ), respectively.
(Equation 2)
OSNR (P ₁ ) ⁻¹ = P _Noise (P ₁ ) / P _sig
OSNR (P ₀ ) ⁻¹ = P _Noise (P ₀ ) / P _sig

  As described above, by calculating the difference between the reciprocals of the OSNR before and after the change in the strength of the additional channel, the amount of noise added to the strength of the operating channel and the strength change of the additional channel is calculated. The OSNR may be calculated from the measured BER.

  The determination unit 160 and the calculation unit 170 can be realized, for example, by executing a predetermined program on the CPU.

  Here, processing from determining an additional channel in the network control apparatus 100 to transmitting a control signal to the transmission apparatus 200 will be described.

  First, when it is determined that a channel is to be added on a transmission path between a certain transmission device 200, the control unit 130 notifies the signal allocation unit 140 of the transmission device 200 that is the transmission source and reception destination of the channel to be added.

  Note that the channel addition is determined by transmitting a request signal from the transmission apparatus 200 to the network control apparatus 100. Further, the network control apparatus 100 may make a decision based on the state of the network 10.

  The signal allocation unit 140 detects the operation channel in the transmission path of the channel to be added from the network information management unit 150, determines the extension channel from the non-operation channel, and notifies the control unit 130 of the extension channel. Note that the signal allocation unit 140 may set the additional channel at a position where the influence is reduced by using the operation channel arrangement information of the network information management unit 150.

  The control unit 130 controls the control signal generation unit 120 so as to generate a control signal for the transmission apparatus 200 that is the transmission source of the extension channel.

  The control signal generation unit 120 generates a control signal addressed to the transmission device 200 that is the transmission source of the extension channel according to the control of the control unit 130, and transmits the control signal from the communication unit 110 to the corresponding transmission device 200. .

  Also, information on the channel to be measured addressed to each transmission device 200 generated by the control signal generation unit 120 in the transmission device 200 at the termination (reception) destination of the signal of the extension channel from the communication unit 110 and the signal of the measurement target channel. A control signal including is transmitted. Regardless of the influence, the signal may be transmitted to the transmission apparatus 200 on the terminal side of the channel signal that passes through a part of the transmission path through which the signal of the additional channel is transmitted.

  For example, in the network 10 as shown in FIG. 1, when a channel is added from the transmission device 200a to the transmission device 200c, if the additional channel is determined, at least one of the transmission paths between the transmission devices 200a-200b and 200b-200c is required. On the other hand, a control signal is transmitted to each transmission device 200 that terminates the measurement target channel that is an operation channel affected by the additional channel and to the transmission device 200a that is newly added.

  Next, an example of a functional block diagram of the transmission apparatus 200 is shown in FIG. The transmission apparatus 200 includes a communication unit 210, a control unit 220, a measurement unit 230, a selection unit 240, a branching unit 250, a reception processing unit 260, a transmission signal setting unit 270, a signal generation unit 280, and a multiplexing unit 290.

  The communication unit 210 notifies the control unit 220 of the control signal received from the network control measure 100.

  In addition, the communication unit 210 transmits the measurement result of the signal measured by the measurement unit 230 to the network control device 100.

  The control unit 220 uses a control signal related to transmission among the control signals from the communication unit 210 for control of the transmission signal setting unit 220. In addition, a control signal related to measurement (reception side) among control signals from the communication unit 210 is used to control the measurement unit 230.

  The measuring unit 230 measures the signal of the target channel among the signals branched by the branching unit 250. In addition, the communication unit 210 is notified of the measurement result. The measurement unit 230 includes a measurement wavelength setting unit 231 and a monitor unit 232.

  The measurement wavelength setting unit 231 sets a channel to be measured by the transmission apparatus 200 from the reception-side control signal sent from the control unit 220.

  Note that the measurement wavelength control unit 220 is configured by, for example, a wavelength tunable filter.

  The monitor unit 230 measures the signal characteristics of the channel set by the measurement wavelength setting unit 220.

  The monitor unit 230 includes, for example, a photodiode (PD) and an analog / digital converter.

  Note that the signal characteristics of the channel signal terminated in the reception processing unit 260 instead of the monitor unit 230 may be measured.

  The selection unit 240 divides a wavelength multiplexed signal transmitted from another transmission apparatus 200 into a signal of a channel that terminates in the own transmission apparatus 200 and a signal of a channel that does not terminate. The signal of the channel that does not terminate is sent to the multiplexing unit 290, and the signal of the channel that terminates is sent to the reception processing unit 260 side.

  The selection unit 240 is composed of, for example, a wavelength selective switch.

  The branching unit 250 branches the terminating channel selected by the selecting unit 240 for measurement and termination.

  The branching unit 240 may be provided in front of the selection unit 240 to branch the signal before being selected by the selection unit 240.

  Note that the branching unit 250 is configured by a splitter, for example.

  The reception processing unit 260 performs signal processing on the signal of the channel that terminates in the own transmission apparatus 200 using photoelectric conversion or the like.

  The reception processing unit 260 includes, for example, a photodiode, an integrated circuit such as an ASIC or FPGA.

  The transmission signal setting unit 270 sets a signal to be transmitted from the own transmission apparatus 200 under the control of the control unit 220.

  The transmission signal setting unit 270 can be realized, for example, by executing a predetermined program by the CPU.

  Based on the control information from the transmission signal setting unit 270, the signal generation unit 280 generates probe light at the position of the additional channel. The signal generation unit 280 also generates signal light for the operation channel that is the transmission source of the transmission apparatus 200. The signal generator 280 modulates the signal light generated by the transmission apparatus 200 based on the setting of the transmission signal setting unit 270.

  The signal generation unit 280 includes, for example, a light emitting element such as a laser diode (LD) and a modulator.

  The multiplexing unit 290 multiplexes the signal of the channel that does not terminate in the transmission apparatus 200 among the signals branched by the selection unit 240, the signal of the channel generated by the signal generation unit 280, and the like.

  The multiplexing unit 290 is configured by AWG, for example.

  A case where the transmission apparatus 200 receives a control signal from the network control apparatus 100 will be described using an example of a flowchart of FIG. In FIG. 4, the description is made in consideration of the control for both the operation channel and the extension channel.

  When the communication unit 210 receives a control signal from the network control device 100, the control unit 220 checks whether the control signal is control on the reception side or control on the transmission side (step S10). In the case of control on the receiving side (S10: No), the measurement wavelength setting unit 231 selects a channel to be measured by the transmission apparatus 200 based on the control signal by the measurement unit 230 (step S11).

  When a channel is selected, it is checked whether a signal is received from the other transmission apparatus 200 (step S12). When not receiving (S12: No), it waits until receiving.

  When a signal is received from another transmission apparatus 200 (S12: Yes), the signal characteristic of the signal of the target channel is obtained by the monitor unit 232 (step S13), and the result is transmitted from the communication unit 210 to the network control apparatus 100. (Step S14), and the process ends.

  When the control signal from the network control device 100 is a control signal on the transmission side (S10: Yes), the control unit 220 determines whether the control in the control signal makes the additional channel symmetrical (step S15).

  If it is determined that the amplification channel is the target (step S15: Yes), the transmission signal setting unit 270 sets the channel, and the signal generation unit 280 generates the probe light in the corresponding channel (step S16) and applies the modulation. To generate an extension channel signal. In addition, the control unit 220 checks whether the control signal includes control information for the operation channel (step S17).

  Note that the determination of the channel to be controlled by the transmission signal setting unit 270 (S15 and S17) may be performed simultaneously, or one of them may be determined, and then the other determination may be performed.

  If it is determined in step S15 that the channel is not a target for the extension channel (step S15: No) or if it is determined in step S17 that the control information for the operation channel is included (step S17: Yes), the signal generator 280 performs the target operation. Signal light is generated for the channel (step S18).

If it is determined in step S15 that the channel is not an extension channel target (step S15: No), the process in step S17 may be performed. In the case of the flowchart of FIG. 4, since it is previously checked whether it is transmission control information (step S10), if one (additional channel) is not the target, the other (operation channel) is the target.

  After the process of step S18 or when it is determined in step S17 that the control information of the operation channel is not included (step S17: No), the multiplexing unit 290 multiplexes the channel signals (step S19) from the transmission apparatus 200. Output and finish the process. When a signal of another channel is sent from the selection unit 240, the signal is multiplexed with the channel generated by the signal generation unit 280 and output in the process of step S19.

  Next, an example of the relationship between the operation channel and the extension channel in a certain transmission path between certain transmission apparatuses 200 is shown in FIGS.

  FIG. 5A shows a signal to the operation channels 50a, 50b, 50c, 50d and the extension channel 60 passing through any of the transmission paths between the transmission device 200a-transmission device 200b and the transmission device 200b-transmission device 200c in the network 10. It is an example of the figure which shows the transmission apparatus 200 (Tx node) which inserts and transmits light, the transmission apparatus 200 (relay node) to relay, and the relay apparatus 200 (Rx node) to receive (terminate). Note that the operation channels 50a, 50b, 50c, and 50d are simply referred to as the operation channel 50 when not distinguished from each other.

  Note that the information on the operation channel in FIG. 5A is stored in the network information management unit 150.

  FIG. 5B shows a transmission path when signals are generated and transmitted to the operation channel 50 and the additional channel 60 in the state of FIG. 5A between the transmission device 200a and the transmission device 200d in the network 10. It is.

  FIG. 6A is a diagram illustrating an arrangement of signals of each operation channel 50 and signals of the extension channel 60 in the transmission path of the transmission device 200a to the transmission device 200b of FIG. 5B.

  FIG. 6B is a diagram showing an arrangement of the operation channels 50, the signals, and the signals of the extension channels 60 in the transmission path of the transmission apparatus 200b to the transmission apparatus 200c of FIG.

  Here, a method for determining a measurement target channel will be described.

  When the extension channel 60 is determined, a signal is generated and transmitted to the operation channel 50 in which at least part of the transmission path through which the extension channel 60 and the extension channel 60 pass is the same. The transmission device 200 that terminates the signal of the operation channel 50 detects the signal of the operation channel 50 that is affected by an increase of a predetermined value or more from the signal characteristics such as BER and OSNR of the received operation channel 50 signal. The measurement target channel.

  The measurement target channel may be determined on the transmission apparatus 200 side, and the presence / absence of the target may be transmitted to the network control apparatus 100, or signal characteristic information may be transmitted from the transmission apparatus 200 to the network control apparatus 100. Thus, the network control apparatus 100 may determine whether or not there is a target.

  In this way, the measurement target channel is determined by determining the signal of the operation channel 50 that is affected by the signal of the extension channel 60. In addition, the intensity of the signal of the extension channel 60 at that time is an intensity at which the influence can be recognized, for example, the intensity at which the signal of the extension channel 60 exceeds a predetermined BER by self-phase modulation or the maximum value of the predetermined measurement intensity.

  In addition, when the measurement in the affected range is not performed, the signal of the channel passing through the same transmission path may be used as the signal of the measurement target channel even in a part of the transmission path through which the signal of the additional channel passes.

  Further, the affected range may be determined in advance. For example, the signal of the measurement target channel may be measured using channels within a predetermined interval as the measurement target channel.

  When the channel to be measured in the extension channel 60 is determined, the influence of the extension channel 60 on the signal strength (increase / decrease in BER, noise amount, etc.) is examined, and the signal strength limit value of the extension channel 60 is determined. An example of a method for measuring the intensity limit value will be described with reference to FIG.

  FIGS. 7A to 7C show examples in which the signal strength of the extension channel 60 is changed in the signals of the extension channel 60 and the operation channel 50 used in FIGS. 5 and 6. FIGS. 7D to 7F show BERs corresponding to the signals of the operation channels 50a, 50b, 50c, and 50d corresponding to FIGS. 7A to 7C as BERs 55a, 55b, 55c, and 55d, respectively. FIG. Hereinafter, when not distinguished, it is simply described as BER55.

  7 (a) to 7 (c) is a description of the channel arrangement in which the transmission paths between the transmission apparatus 200a and the transmission apparatus 200c are combined. The influence received from the signal is only in the same section. For example, in the arrangement shown in FIGS. 6A and 6B, the signal of the operation channel 50a is affected by the extension channel 60 only in the transmission path between the transmission device 200a and the transmission device 200b.

  Further, an allowable limit BER 70 is described as an allowable limit of the signal characteristics.

  The allowable limit BER 70 is, for example, a value that satisfies the BER required by the communication standard. Further, instead of the allowable limit BER 70, for example, signal characteristics such as OSNR may be used as a reference.

  FIG. 7A shows a BER 55 when a signal is generated in the extension channel 60 with weak probe light. In this case, since all the BERs 55 are within the allowable limit BER 70, the signal strength of the extension channel 60 is increased as shown in FIG.

  Also in FIG. 7 (e) corresponding to FIG. 7 (b), all the BERs 55 are within the allowable limit BER 70, so the signal strength of the additional channel 60 is increased and the measurement is performed again.

  In FIG. 7F corresponding to FIG. 7C, the BER 55b exceeds the allowable limit BER70. From this result, since the signal of the extension channel 60 cannot be used with the strength used in FIG. 7C, the strength of the extension channel 60 in FIG. 7B just before that becomes the strength limit value.

  Note that the measurement of the intensity limit value is not limited to this, and the intensity limit value may be measured.

  The determination unit 160 determines whether or not the allowable limit BER 70 is exceeded, and stores the BER 55 at each strength up to the strength limit value in the network information management unit 150. In addition to the BER 55, an increase / decrease in the amount of noise accompanying the intensity change of the extension channel 60 is calculated by the calculation unit 170 and stored. Note that information other than the noise amount and BER 55 is also measured and calculated as necessary and stored in the network information management unit 150.

  In addition, although the measurement etc. were performed with respect to the signal of all the operation channels 60, the signal of the measurement object channel demonstrated above may be predetermined and only the signal of a measurement object channel may be measured.

  When the detection and measurement of signal characteristics and the like up to the intensity limit value of the signal of the extension channel 60 are completed, the measurement ends.

  Next, a method for determining the signal strength of the extension channel 60 will be described based on the detection and measurement results.

  FIG. 8 is an example showing a change in the BER 65, which is the BER of the signal of the BER 55 and the extension channel 60, with a change in the intensity of the signal of the extension channel 60. Note that the BER 65 in FIG. 8 takes into consideration the influence that the signal of the extension channel 60 receives from the signal of the operation channel 50. Note that the signal of the operation channel 50 is affected by the signals of other operation channels 50, but is included in the BER 55 as being considered before the addition.

  In FIG. 8, a range 75 in which the BER 65 is equal to or less than the allowable limit BER 70 is defined, and the minimum allowable strength in which the signal strength of the extension channel 60 is the minimum strength in the range 75 is defined as strength 71. The range 75 may not be determined.

  Further, an intensity 72 that is an ideal intensity of the signal of the extension channel 60 within a range 75 that is equal to or less than the allowable limit BER 70 is determined. In FIG. 8, the position of the minimum BER 65 is the intensity 72, but the present invention is not limited to this, and it may be changed depending on the condition obtained within the range 75 that is equal to or less than the allowable limit BER 70.

  The intensity of the signal of the additional channel 60 that first exceeds the allowable limit BER 70 of the BER 55 is the maximum allowable intensity in the signal of the operation channel 50 (in the case of FIG. 8, the contact point between the BER 55b and the allowable limit BER 70) is the intensity 73.

  An example of the strength setting method for operating the signal of the extension channel 60 using the strengths 71, 72, 73 determined based on the BER 55 and the BER 65 is shown in the flowchart of FIG.

  When the strengths 71, 72, and 73 are determined, it is checked whether or not the strength 73 is greater than the strength 71 (step S30). If the intensity 73 is greater than the intensity 71 (step S30: Yes), it is checked whether the intensity 72 is greater than the intensity 73 (step S31).

  If the strength 72 is greater than the strength 73 (step S31: Yes), the strength of the signal of the extension channel 60 is set to the strength 73 (step S32), and the strength setting ends.

  When the strength 72 is equal to or less than the strength 73 (step S31: No), the strength of the signal of the extension channel 60 is set to the strength 72 (step S33), and the strength setting is finished.

  When the strength 73 is 71 or less (No in step S30), the extension to the extension channel 60 is not possible, and the signal allocation unit 140 is notified to change the setting other than the signal strength (step S34), and the process is ended.

  For example, if the strength 73 is 71 or less in the arrangement of FIGS. 6A and 6B, the position of the extension channel 60 is changed to a position between the extension channel 60 and the operation channel 50c in step S34, and again, taking measurement.

  As described above, when adding a channel to be operated in the network 10, considering the influence of the signal of the extension channel 60 on the signal of the operation channel 50, the signal of the operation channel 50 and the signal of the extension channel 60 are set to a predetermined BER or the like. Within the range not exceeding the value, it is possible to set the strength for operating the signal of the extension channel 60.

  In addition, by measuring the amount of noise and the allowable limit strength in advance, it is possible to change the strength within the limit value to increase the signal strength when additional transmission line input power is required after adding the extension channel 60. It is possible to respond immediately.

  In addition, when the extension channel 60 is added and further channels are added, the intensity can be adjusted from the measured noise amount.

  Note that although the amount of noise is calculated by the network control device 100, it may be calculated by each transmission device 200.

  In addition, although it demonstrated as an extension channel, it is not limited to this, The same method can also be used for the measurement when switching the transmission path of the signal of the channel in operation.

(Embodiment 2)
In the first embodiment, the measurement of the BER 55 and the like in the case of one extension channel 60 is performed, and the signal strength setting of the extension channel 60 has been described. In the second embodiment, the signal strength setting of the extension channel 60 when there are a plurality of extension channels 60 in the transmission path between a certain transmission apparatus 200 will be described. In the second embodiment, it is assumed that the extension channel 60 does not transmit the transmission path between the same transmission apparatuses 200.

  In the second embodiment, the network 10, the network control device 100, and the transmission device 200 are used as in the first embodiment.

  As an example of the second embodiment, an example of the relationship between the operation channel 50 and the extension channel 60 in a transmission path between a certain transmission apparatus 200 is shown in FIGS.

  FIG. 10A shows operation channels 50a, 50b, and 50c passing through any of the transmission paths between the transmission apparatus 200a-transmission apparatus 200b, the transmission apparatus 200b-transmission apparatus 200c, and the transmission apparatus 200c-transmission apparatus 200d in the network 10. , 50d, 50e, and transmission channel 200 (Tx node) for transmitting signals of extension channels 60a, 60b, transmission device 200 (relay node) for relay, and relay device 200 (Rx node) for reception (termination) It is an example. Note that the operation channels 50a, 50b, 50c, 50d, and 50e and the extension channels 60a and 60b are simply referred to as the operation channel 50 and the extension channel 60 unless they are distinguished.

  FIG. 10B shows a transmission path when signals are generated and transmitted to the operation channel 50 and the extension channel 60 in the state of FIG. 10A between the transmission device 200a and the transmission device 200d in the network 10. It is.

  FIG. 11A is a diagram showing the arrangement of the signals of the operation channels 50 and the signals of the additional channels 60 in the transmission path of the transmission apparatuses 200a to 200b of FIG. 10B.

  FIG. 11B is a diagram showing the arrangement of the signals of the operation channels 50 and the signals of the additional channels 60 in the transmission path of the transmission apparatuses 200b to 200c of FIG. 10B.

  FIG. 11C is a diagram showing an arrangement of the signals of the operation channels 50 and the signals of the additional channels 60 in the transmission path of the transmission device 200c to the transmission device 200d of FIG. Note that the operation channel 50e is located at the same position as the operation channel 50c in FIGS. 11A and 11B and does not transmit between the same transmission apparatuses 200.

  This is because the operation channel 50c is terminated at the transmission device 200c and is not used after the transmission device 200c, so the operation channel 50e can be used in the same arrangement.

  When there are signals of a plurality of extension channels 60 as shown in FIGS. 10 and 11, the signals of the operation channels 50 that are affected by the signals of the respective extension channels 60 are examined. Therefore, it is investigated whether only one of the signals of the extension channel 60 is transmitted among the signals of the extension channel 60 to affect the signal of each operation channel 50.

  For example, only the signal of the extension channel 60a is transmitted together with the signal of the operation channel 50, and the operation channel that is affected by the increase of a predetermined value or more from the value of BER, OSNR, etc. of the received signal of the operation channel 50 50 signals are detected and set as measurement target channels.

  Similarly, also in the signal of the extension channel 60b, the measurement target channel is detected from the operation channel 50 that partially passes through the same transmission path.

  When the measurement target channel is determined, the influence (BER, OSNR, etc.) of the operation channel signal is measured according to the signal strength of each extension channel 60.

  The influence (BER 55 and the like) that each additional channel 60 has on the operation channel 50 is measured for each strength. When the measurement is completed, the strength of each additional channel 60 is determined from the measurement result.

  In addition, after detecting the signal of the operation channel 50 affected by the signal of each extension channel 60 first, each influence (BER55 etc.) was measured, but it is made to detect and measure for every signal of the extension channel 60. May be.

  A method for setting the signal strength of the extension channel 60 will be described with reference to FIG.

  FIG. 12 shows the BER BERs 55a, 55b, 55c, 55d, 55e corresponding to the signals of the operation channels 50a, 50b, 50c, 50d, 50e and the BERs BER 65a, 65b corresponding to the signals of the additional channels 60a, 60b. It is an example which shows the change accompanying 60 intensity | strength changes. FIG. 12 shows a case where the extension channels 60 have the same strength. In the following description, the BERs 55a, 55b, 55c, 55d, and 55e and the BERs 65a and 65b are simply referred to as BER55 and BER65 when they are not distinguished.

  The BER 55 calculates the BER 55 based on the total noise amount by adding the noise amounts calculated from the influence of the operation channel 50 signal from the signals of the additional channels 60.

  For example, the OSNR and the like can be calculated by accumulating the amount of noise that the operation channel 50 b receives from the signal of each additional channel 60.

  The strengths 71, 72, and 73 are determined as in the first embodiment. The strength 71 is the minimum strength at which both the BERs 65a and 65b are less than or equal to the allowable limit BER70.

  Further, the intensity 72 is, for example, an average value of the intensity that is the minimum value of each BER 65, an intensity that is the same as any of the specified minimum value of the BER 65 and the signal of the operation channel 50.

  Based on the strengths 71 to 73, the signal strength of the extension channel 60 is set.

  As described above, the signals of the operation channel 50 and the signals of the respective extension channels 60 are taken into consideration when the influence of the signals of the plurality of extension channels 60 on the signals of the operation channel 50 is increased when a plurality of channels operated in the network 10 are added. It is possible to set the strength for operating the signal of the extension channel 60 so that the signal is received within a range that does not exceed a predetermined value such as BER.

  Further, by measuring the noise amount and the allowable limit strength in advance, it becomes possible to quickly cope with the case where the transmission line input power is further required after the extension channel 60 is added.

  In addition, when the extension channel 60 is added and further channels are added, the intensity can be adjusted from the measured noise amount.

(Embodiment 3)
In the second embodiment, the measurement of the BER 55 and the like when the signals of the plurality of extension channels 60 do not transmit the transmission path between the same transmission apparatuses 200, and the setting of the signal strength of the extension channels 60 have been described. In the third embodiment, intensity setting in a plurality of additional channels 60 in which the transmission apparatus 200 of the transmission source and the transmission apparatus 200 of the reception (termination) destination are the same will be described.

  In the third embodiment, the network 10, the network control device 100, and the transmission device 200 are used as in the first embodiment.

  As an example of the third embodiment, an example of the relationship between the operation channel 50 and the extension channel 60 in a transmission path between a certain transmission apparatus 200 will be described with reference to FIGS.

  FIG. 13A shows operation channels 50a, 50b, and 50c passing through any of the transmission paths between the transmission apparatus 200a-transmission apparatus 200b, the transmission apparatus 200b-transmission apparatus 200c, and the transmission apparatus 200c-transmission apparatus 200d in the network 10. , An example of a diagram showing a transmission apparatus 200 (Tx node) that transmits a signal of 50d and signals of extension channels 60a and 60b, a transmission apparatus 200 (relay node) that relays, and a relay apparatus 200 (Rx node) that receives (ends) It is. Note that the operation channels 50a, 50b, 50c, and 50d and the extension channels 60a and 60b are simply referred to as the operation channel 50 and the extension channel 60 unless they are distinguished from each other.

  FIG. 13B is a diagram illustrating a transmission path of the signal of each operation channel 50 and the signal of each additional channel 60 in the state of FIG. 13A between the transmission device 200 a and the transmission device 200 d in the network 10.

  FIG. 14A is a diagram showing an arrangement of signals of each operation channel 50 and signals of each additional channel 60 in the transmission path of the transmission apparatus 200a to the transmission apparatus 200b of FIG. 13B.

  FIG. 14B is a diagram showing the arrangement of the signals of the operation channels 50 and the signals of the additional channels 60 in the transmission path of the transmission device 200b to the transmission device 200c of FIG.

  Similarly to the second embodiment, in order to examine the signal of the operation channel 50 that the signal of each extension channel 60 affects, the signal is generated and transmitted only to any one of the extension channels 60, It is investigated whether the signal of the operation channel 50 is affected.

  For example, only the signal of the extension channel 60a is transmitted together with the signal of the operation channel 50, and the operation channel that is affected by the increase of a predetermined value or more from the value of BER, OSNR, etc. of the received signal of the operation channel 50 50 is detected as a measurement target channel.

  Similarly, the operation channel 50 affected by the signal of the extension channel 60b is detected.

  Note that, as in the third embodiment, the transmission apparatus 200 of the transmission destination and the transmission apparatus 200 of the reception (termination) destination are the same for the signals of the plurality of extension channels 60, and further, the signals of the extension channels 60 have the same strength. In this case, the extension channels 60a and 60b may be measured together. For example, the signals may be collectively measured when the signals of the extension channels 60a and 60b have the same strength with the same subcarrier.

  Since the signal of the extension channel 60 is transmitted through the transmission path between the same transmission apparatuses 200, the signal of the extension channel 60 may affect the signals of the other extension channels 60.

  Therefore, since it is necessary to consider the influence when the signal of the other extension channel 60 is affected, for example, when measuring the signal of the extension channel 60a, the signal of the extension channel 60b is transmitted together with a certain strength. The measurement of the influence which the signal of the extension channel 60b receives from the signal of the extension channel 60a is performed simultaneously. For example, the increase / decrease in the noise amount is calculated from the noise amount for each intensity based on the influence of the signal of the extension channel 60a from the signal of the extension channel 60b.

  Further, the measurement and calculation of the influence of the signal of the extension channel 60 from the signal of the other extension channel 60 may be performed separately from the measurement and calculation of the influence of the signal of the operation channel 50.

  When the signal of the operation channel 50 affected by the signal of the extension channel 60 and the signal of the other extension channel 60 are determined, the influence of the signal of the operation channel 50 is measured and calculated according to the intensity of the signal of each extension channel 60.

  The influence of the signal of each extension channel 60 on the signal of the other extension channel 60 and the signal of the operation channel 50 is measured and calculated for each intensity, and when completed, the intensity of the signal of the extension channel 60 is determined from the measurement and calculation results.

  Note that the BER 55 and the like are measured after detecting the signal of the operation channel 50 that is affected by the signal of each extension channel 60 first, but detection, measurement, and calculation are performed for each signal of the extension channel 60. May be.

  The intensity setting method will be described with reference to FIG.

  FIG. 15 shows the BER BERs 65a and 65b corresponding to the BER BERs 55a, 55b, 55c and 55d corresponding to the signals of the operation channels 50a, 50b, 50c and 50d and the signals of the additional channel 60 corresponding to the signals of the additional channels 60a and 60b. It is an example which shows the change accompanying an intensity | strength change. FIG. 15 shows the case where the extension channels 60 have the same strength. In the following description, BERs 55a, 55b, 55c, and 55d and BERs 65a and 65b are simply referred to as BER55 and BER65, respectively, when no distinction is made.

  The BER 55 calculates the BER 55 from the total noise amount by adding the noise amounts calculated from the influence of the operation channel 50 signal from the signals of the additional channels 60. Further, the BER 65 takes into consideration the influence from the signals of other extension channels 60 and the operation channel 50.

  The strengths 71, 72, and 73 are determined as in the first embodiment. Note that the strength 71 is the minimum strength at which both the BERs 65a and 65b are less than or equal to the allowable limit BER70.

  Further, the intensity 72 is, for example, an average value of the intensity that is the minimum value of the BER 65, an intensity similar to any of the minimum value of the BER 65 of the signal of the designated extension channel 60, and the signal of the operation channel 50.

  Based on the strengths 71 to 73, the strength of the extension channel 60 is set.

  As described above, when a plurality of channels operated in the network 10 are added on the transmission path between the same transmission apparatuses 200, the influence of the signals of the plurality of extension channels 60 on the signal of the operation channel 50 is taken into consideration. It is possible to set the strength for operating the signal of the extension channel 60 so that the signal and the signal of each extension channel 60 are received within a range not exceeding a predetermined value such as BER.

  Further, by measuring each noise amount and allowable limit strength in advance, it becomes possible to quickly cope with the case where transmission line input power is further required after the extension channel 60 is added.

  In addition, when the extension channel 60 is added and further channels are added, the intensity can be adjusted from the measured noise amount.

(Embodiment 4)
In the third embodiment, the signal strength setting of the extension channel 60 in the plurality of extension channels 60 in which the transmission apparatus 200 of the transmission source and the transmission apparatus 200 of the reception (termination) destination are the same has been described. In the fourth embodiment, a transmission path between transmission devices 200 in which a part of signals of a plurality of additional channels 60 in which at least one of the transmission device 200 of the transmission source and the transmission device 200 of the reception (termination) destination is different is the same. Will be described.

  As an example of the fourth embodiment, an example of the relationship between the operation channel 50 and the extension channel 60 in a transmission path between a certain transmission apparatus 200 will be described with reference to FIGS. In FIG. 16 and FIG. 17, extension channels 60a and 60b show an example in which both the transmission device 200 at the transmission source and the transmission device 200 at the reception (termination) destination are different.

  FIG. 16A shows operation channels 50a, 50b, and 50c passing through any of the transmission paths between the transmission apparatus 200a-transmission apparatus 200b, the transmission apparatus 200b-transmission apparatus 200c, and the transmission apparatus 200c-transmission apparatus 200d in the network 10. , 50d, 50e, and transmission channel 200 (Tx node) for transmitting signals of extension channels 60a, 60b, transmission device 200 (relay node) for relay, and relay device 200 (Rx node) for reception (termination) It is an example. Note that the operation channels 50a, 50b, 50c, 50d, and 50e and the extension channels 60a and 60b are simply referred to as the operation channel 50 and the extension channel 60 unless they are distinguished.

  FIG. 16B is a diagram illustrating a transmission path of the signal of the operation channel 50 and the signal of the additional channel 60 in the state of FIG. 16A between the transmission device 200a and the transmission device 200d in the network 10.

  FIG. 17A is a diagram illustrating an arrangement of signals of each operation channel 50 and signals of each additional channel 60 in the transmission path of the transmission apparatus 200a to the transmission apparatus 200b of FIG.

  FIG. 17B is a diagram illustrating an arrangement of signals of each operation channel 50 and signals of each additional channel 60 in the transmission path of the transmission apparatus 200b to the transmission apparatus 200c of FIG.

  FIG. 17C is a diagram showing an arrangement of signals of each operation channel 50 and signals of each additional channel 60 in the transmission path of the transmission device 200c-transmission device 200d of FIG. The operation channel 50e is arranged at the same position as the operation channel 50c as in the second embodiment.

  In the fourth embodiment, as in the second and third embodiments, in order to examine the signal of the operation channel 50 affected by the signal of each extension channel 60, one of the extension channels 60 of the extension channels 60 is checked. A signal is generated and transmitted to investigate whether the signal of each operation channel 50 is affected.

  Further, as in the third embodiment, since there is a possibility of affecting the signals of the other extension channels 60, it is also checked whether the signals of the other extension channels 60 are affected. For example, it is examined whether the signal of the extension channel 60a affects the signal of the extension channel 60b.

  When the signal of the operation channel 50 and the signal of the other extension channel 60 that influences are determined, the intensity of the signal of the other extension channel 60 is fixed and the measurement according to the strength is performed.

  When the measurement of each extension channel 60 is completed, the strength setting is performed.

  The intensity setting may be the same when the range 75 is within the same intensity as in the second and third embodiments, but when the extension is added as shown in FIGS. 16 and 17, the same range 75 is not provided. There is. The intensity setting method at that time will be described with reference to FIGS.

  In FIG. 18 and FIG. 19, the strength setting is performed in the order of the extension channels 60a and 60b, but the present invention is not limited to this, and it may be performed in the order of 60b and 60a.

  FIG. 18 shows the BER BER 65a corresponding to the BER BER 55a, 55b, 55c, 55d, 55e corresponding to the operation channel 50a, 50b, 50c, 50d, 50e signal and the extension channel 60a signal of the extension channel 60a. It is an example which shows the change accompanying an intensity | strength change. In the following description, BERs 55a, 55b, 55c, 55d, and 55e are simply referred to as BER55 when they are not distinguished.

  FIG. 19 is an example showing a change in the BER 65b of the BER corresponding to the signals of the BER 55, the BER 65a, and the extension channel 60b according to the signal intensity change of the extension channel 60b. In the following description, BERs 65a and 65b are simply referred to as BER65 when they are not distinguished.

  As shown in FIG. 18, with reference to BER 65a, BER 55, etc., the signal strength of the extension channel 60a is determined by setting the strengths 71a, 72a, 73a and the range 75a with the method shown in the first embodiment. The intensity is set to the intensity 72a. The strengths 71a, 72a, 73a and the range 75a have the same meanings as the strengths 71, 72, 73 and the range 75 of the first embodiment.

  After determining the strength of the extension channel 60a as the strength 72a, as shown in FIG. 19, the signal of the extension channel 60a is also used as the operation channel signal, and the strength of the signal of the extension channel 60b is set to the strength 71b, 72b, 73b in the same manner. A range 75b is defined and an intensity 72b is set. The strengths 71b, 72b, 73b and the range 75b have the same meanings as the strengths 71, 72, 73 and the range 75 of the first embodiment.

  By performing as described above, it is possible to set an optimum intensity for the signal of each extension channel 60.

  In addition, although it demonstrated as an intensity | strength setting method when it does not have the same range 75, you may make it set the intensity | strength of the signal of the additional channel 60 separately also when it has the same range 75. FIG.

  As described above, when a plurality of channels to be operated in the network are added, each operation channel 50 signal and each extension channel 60 signal are considered in consideration of the influence of the signals of the plurality of extension channels 60 on the operation channel 50 signal. It is possible to set the strength for operating the signal of the additional channel 60 received within a range not exceeding a predetermined value such as BER.

  Further, by measuring each noise amount and allowable limit strength in advance, it becomes possible to quickly cope with the case where further input strength is required after the extension channel 60 is added.

  In addition, when the extension channel 60 is added and further channels are added, the intensity can be adjusted from the measured noise amount.

(Embodiment 5)
In the first to fourth embodiments, the BER 55 and the BER 65 are measured when the modulation method of the test signal for measurement (probe light) is not changed, and the signal intensity setting of the extension channel 60 based on the measurement result has been described. In the fifth embodiment, in order to make it possible to change the modulation scheme of the signal of the extension channel 60 after the extension, measurement of the intensity limit value of the test signal in a plurality of modulation schemes is performed.

  In the fifth embodiment, a network 10 including a network control device 100 and a plurality of transmission devices 200 is used as in the first embodiment.

  When the extension channel 60 is determined, measurement is performed for a modulation method that may be used for the signal of the extension channel 60.

  The modulation method is changed by, for example, including information on the modulation method in the control signal sent from the control unit 130 of the network control device 100 and sending it to the transmission device 200, and the signal generating unit 280 performs modulation according to the control signal. Change the method.

  The measurement method is the same as in Embodiments 1 to 4, and when the measurement of one modulation method is completed, the next modulation method is measured. For example, a 16QAM signal is measured after measuring when the modulation method is QPSK.

  The amount of noise accompanying the change in signal strength of the extension channel 60 for each modulation method is stored in the network information management unit 150, respectively.

  Note that, in the case of transmitting a transmission line between the same transmission apparatuses 200 even if some of the signals of the plurality of additional channels 60 are transmitted as in the third and fourth embodiments, measurement is performed so as to correspond to each pattern.

  When the measurement of each modulation method is completed, the optimum intensity in each modulation method may be output. In that case, the optimum intensity for each modulation method is determined by the method used in the first to fourth embodiments. Further, when changing the modulation method, the optimum intensity may be measured for the corresponding modulation method.

  As described above, by measuring the influence of each modulation method, it is possible to cope with the case where the modulation method is changed due to the influence of the information amount or the like.

  Further, when changing the modulation method, it is possible to increase the transmission capacity by performing communication without using the signal of the extension channel 60 that has the most influence on the signal of the operation channel 50.

  For example, when the transmission device 200 of the transmission destination and the transmission device 200 of the reception (termination) destination all modulate the signals of the same three additional channels 60 with QPSK, the other two are used without using one. The transmission capacity increases by changing to 16QAM.

(Embodiment 6)
In the fifth embodiment, the measurement method corresponding to the change of the modulation method after the extension of the signal of the extension channel 60 is shown. In the sixth embodiment, a measurement method that can cope with the change of the modulation method in the signal of the operation channel 50 will be described.

  In the sixth embodiment, the network 10 including the network control device 100 and the plurality of transmission devices 200 is used as in the first to fifth embodiments.

  When the extension channel 60 is determined, a measurement is performed for a modulation method that may be used for the signal of the affected operation channel 50.

  The modulation scheme is changed by, for example, sending information related to the modulation scheme in the control signal from the control unit 130 to the transmission apparatus 200, and the transmission apparatus 200 that is the transmission source of the signal of the operation channel 50 receives the signal according to the control signal. The generator 280 changes the modulation method.

  The measurement method is the same as in the first to fourth embodiments. When the measurement of one modulation method is completed for the signal of the operation channel 50, the next modulation method is measured. Further, the signal of the operation channel 50 corresponding to the modulation method to be measured for each signal strength of the extension channel 60 may be measured.

  Note that the amount of noise of the signal of the operation channel 50 for each modulation method according to the change in signal strength of the extension channel 60 is stored in the network information management unit 150, respectively.

  When the measurement for each modulation method of the signal of the operation channel 50 is completed, the optimum intensity corresponding to each may be output. In that case, the optimum intensity for each modulation method is determined by the method used in the first to fourth embodiments. Further, when changing the modulation method, the optimum intensity may be measured for the corresponding modulation method.

  As described above, by measuring the influence of each modulation method, it is possible to cope with changing the modulation method.

  Further, in accordance with the change of the modulation method of the signal of the extension channel 60 described in the fifth embodiment, it is possible to cope with the change of the modulation method of the signal of the operation channel 50 for each modulation method.

  As described above, the most preferable embodiment and the like have been described in the network transmission system. However, the present invention is not limited to the above description, and is described in the claims or for carrying out the invention. It goes without saying that various modifications and changes can be made by those skilled in the art based on the gist of the invention disclosed in the embodiments, and such modifications and changes are included in the scope of the present invention.

10 Network 50 Operation channel 55 Operation channel BER
60 Extension channel 65 Extension channel BER
70 Tolerable limit BER
71 Minimum permissible strength 72 Ideal strength 73 Permissible limit strength 75 Permissible range 100 Network control device 110 Communication unit 120 Control signal generation unit 130 Control unit 140 Signal allocation unit 150 Network information management unit 160 Determination unit 170 Calculation unit 200 Transmission device 210 Communication unit 220 control unit 230 measurement unit 231 measurement wavelength setting unit 232 monitor unit 240 selection unit 250 branching unit 260 reception processing unit 270 transmission signal setting unit 280 signal generation unit 290 multiplexing unit

Claims (10)

In a network transmission system comprising a plurality of transmission devices and a network control device,
The first transmission device among the plurality of transmission devices is:
Transmitting a signal of a first channel at a first intensity to a second transmission device among the plurality of transmission devices;
The second transmission device transmits first information related to the signal quality of the signal of the first channel having the terminated first strength to the network control device,
The third transmission device among the plurality of transmission devices terminates the signal of the second channel passing through at least a part of the transmission path through which the signal of the first channel passes, and Sending second information about the signal to the network controller;
The network control device transmits to the first transmission device information on a second strength that is an output strength of the signal of the first channel based on the first information and the second information;
The transmission system, wherein the first transmission device transmits a signal of the first channel with the second strength.
The network control device notifies the first transmission device of the first strength, and is included in the second information measured by the third transmission device when transmitted at the first strength. If the second signal quality does not exceed a predetermined signal quality, the first transmission device is notified of a third strength that is increased from the first strength, and the measured second signal quality is If the predetermined signal quality is exceeded, an upper limit strength is obtained based on the measured second signal quality and the first quality information included in the first information, and the second strength is within the upper limit strength. The transmission system according to claim 1, wherein:
3. The transmission system according to claim 1, wherein the network control device notifies the first transmission device by including information on a modulation scheme when notifying the strength.
The network control apparatus accumulates the first signal quality and the second signal quality corresponding to each of a plurality of modulation schemes, and the first corresponding to the modulation scheme to be changed when the modulation scheme changes. 4. The transmission system according to claim 3, wherein the second strength is set based on signal quality and the second signal quality.
The network control device transmits a control signal to the second transmission device and the third transmission device so as to measure a signal quality of a signal of a specific channel;
The second transmission device transmits the first quality information based on the control signal,
The transmission system according to any one of claims 1 to 4, wherein the third transmission device transmits the second quality information based on the control signal.
6. The signal of the first channel is a signal of a channel newly added between the first transmission device and the second transmission device in the network. Transmission system.
A fourth transmission device among the plurality of transmission devices is:
Transmitting a signal of a third channel at a fourth intensity to a fifth transmission apparatus among the plurality of transmission apparatuses;
The fifth transmission device transmits third information related to the signal quality of the signal of the third channel of the fourth strength terminated to the network control device;
The sixth transmission device of the plurality of transmission devices terminates the signal of the fourth channel passing through at least the first part of the transmission path through which the signal of the first channel passes, and the fourth channel terminated. 4th information regarding the signal of this is transmitted to the said network control apparatus,
The network control device transmits fifth strength information, which is an output strength of the signal of the third channel based on the third information and the fourth information, to the fourth transmission device,
The transmission system according to any one of claims 1 to 6, wherein the fourth transmission device transmits the signal of the third channel at the fifth intensity.
8. The network control apparatus according to claim 7, wherein after receiving the first signal quality and the second quality information, the network control apparatus notifies the fourth transmission apparatus of information related to the signal of the third channel. The transmission system described in 1.
In one transmission apparatus in a network composed of a plurality of transmission apparatuses and a network control apparatus, the signal quality of the first channel signal at the first intensity and the transmission path through which the first channel signal passes are at least partially the same. A receiver for receiving information on the second strength based on the signal quality of the signal of the second channel passing through the transmission path;
A transmission unit that transmits the signal of the first channel at the second intensity.
In a network control device of a network composed of a plurality of transmission devices and a network control device,
Transmission through which the first information on the signal quality measured with respect to the signal of the first channel transmitted at the first intensity from the first transmission device and the signal of the first channel among the plurality of transmission devices. A receiver that receives second information relating to signal quality of a signal of a second channel that passes through a transmission path that is at least partially the same as the path;
A network control apparatus comprising: a transmission unit configured to transmit information on a second intensity based on the first information and the second information to the first transmission apparatus.

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